1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class DM1_1981_I166353 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1981_I166353);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      // Initialise and register projections
22      declare(FinalState(), "FS");
23      book(_num3pip3pim, "TMP/num3pip3pim");
24    }
25
26
27    /// Perform the per-event analysis
28    void analyze(const Event& event) {
29      const FinalState& fs = apply<FinalState>(event, "FS");
30      int ntotal(0);
31      for (const Particle& p : fs.particles()) {
32	if(abs(p.pid())!=211) vetoEvent;
33	++ntotal;
34      }
35      if(ntotal!=6) vetoEvent;
36      _num3pip3pim->fill();
37    }
38
39
40    /// Normalise histograms etc., after the run
41    void finalize() {
42      double fact = crossSection()/ sumOfWeights() /nanobarn;
43      double sigma = _num3pip3pim->val()*fact;
44      double error = _num3pip3pim->err()*fact;
45      Estimate1DPtr mult;
46      book(mult, 1, 1, 1);
47      for (auto& b : mult->bins()) {
48        if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
49          b.set(sigma, error);
50        }
51      }
52    }
53    /// @}
54
55    /// @name Histograms
56    /// @{
57    CounterPtr _num3pip3pim;
58    /// @}
59
60  };
61
62
63  RIVET_DECLARE_PLUGIN(DM1_1981_I166353);
64
65
66}